Rearing is a behavior .. perfectly natural to a horse. When taught appropriately, it is no more dangerous than running, or jumping, or barrel racing, etc. Horses have to be taught when it is APPROPRIATE to run, etc. Heck, LEADING a horse can be dangerous if a horse hasn't been properly taught to lead ..
I think your horse looks calm and well-balanced. Not much different than a Lippizan ..
In my opinion whether or not the OP's choice of action is what I personally agree with or not, I do not think it is my place to give her unsolicited advice on the subject, since she did not ask for any. I agree 100% with SorrelHorse but I also agree that it could be dangerous, it just depends on how the whole thing is done.
Unsolicited advice or not when you put something on an open forum you will get comments.
I hope the OP can keep this horse for the rest of his life because 'button' or not most people don't want a rearer, taught or otherwise.
IMO: Never teach a horse something you wouldn't want it to do while waiting to cross a busy road.
Uhhhh-advice? I think most of us have expressed our opinion, just as you did. We don't agree, This is a forum, and that is our right. She posted pictures of her new "trick" so get a reaction. Some she may like, some probably not so much.
This is the picture section so please remember critiques are not requested. However, when a photograph is taken and another member of this forum feels that there is a potential threat to the OP or any members who may feel the need to attempt something at home, then discussion is permitted, however respectful responses are important.
Although rearing is not a safe trick to teach, I'm not one to judge seeing as I've taught my 20 year old retired mare to rear on command as well. I certainly agree with many of the other comments in that a trick like this should not be taught to a green/young horse and absolutely should not be taught by a green rider. Even an experienced rider can accidentally make the "rear button" too accessible and therefore create a bad riding habit instead of an impressive trick.
He's certainly got the height aspect but I'd like to see more of a forward motion to it - try easing up on his mouth once his front feet leave the ground and see if he's any lighter on his front end through the height of his rear, and hopefully bringing that nose/neck down and forward. In your pics his head is up and slightly off to the side, much more chance of going over or sideways.
A low, controlled rear held for longer is MUCH more impressive than a 2 second high as he can go rear! For example:
Critique would be her shoulder is in front of her hip so when she lands it'll be forward, not backward. Her head is down and looking, not up and evading. Back legs together but spaced for balance. Work on the little things, then height...THEN with a rider. It's one thing for a horse to balance themselves - it's another to balance on 2 legs with a rider, especially if the rider is new to rearing and potentially balancing on the horse's mouth instead of horn/mane.
I'm on the fence about this. My trainer taught her hanoverian to rear on command. He's a very energetic person and while a student was on the mare, the trainer accidently gave the cue (which was lifting her hands up) while trying to explain something to the rider.
Needless to say, it took her FOREVER to break the mare from rearing. Very smart horse with a great memory. It was just dangerous.
The horse looks balanced, and sure it's a great trick and all that. But I would NEVER teach it to a barrel horse. EVER. Barrel horses are a different breed. They get hyped up and teaching a horse to rear, is just going to cause problems in the future. He's a great horse now, but he's young and hasn't been run very much. What happens in 2 years when he is a psycho horse and you can't get him into the gate and since he's been taught to rear, he thinks it's okay, and does it.
I had a pony that was a "hopper" and "semi-rearer" He didn't go high, but it was super annoying. When he got hyped up at the gate, we bounced into the arena a lot of the time until I was able to break him of the very naughty habit.
Rearing is one of the tricks that I never taught my horse. He knows how to shake, bow and lie down on command and that's all the further I ever wanted him to perform because of the story my trainer told me.